Wong Y C, Ip M C
Am J Anat. 1978 Aug;152(4):529-37. doi: 10.1002/aja.1001520407.
According to the staining intensities for AChE, the motor end-plates of the rat diaphragm can be classified into strong (S) and pale (P) types. About 34% of the total end-plates of the rat diaphragm are of S type and 50% of P type. The P end-plates differ from S end-plates in two aspects. First, the secondary subneural clefts of the S end-plates are well developed. They are numerous, long, closely packed and often branched. On the other hand, the secondary subneural clefts of the P end-plates are short, sparse and usually unbranched. Secondly, there seems to be a variation in AChE activity in the P end-plates. Focal negative AChE areas are found in the subneural apparatus of some P end-plates. It is concluded that the less well developed secondary subneural clefts and focal areas of negative AChE activity contribute to the paler staining of the P end-plates.
根据乙酰胆碱酯酶（AChE）的染色强度，大鼠膈肌的运动终板可分为强（S）型和淡（P）型。大鼠膈肌终板总数中约34%为S型，50%为P型。P终板与S终板在两个方面存在差异。首先，S终板的次级神经下间隙发育良好。它们数量众多、长、紧密排列且常分支。另一方面，P终板的次级神经下间隙短、稀疏且通常无分支。其次，P终板中的AChE活性似乎存在差异。在一些P终板的神经下装置中发现了局灶性AChE阴性区域。得出的结论是，次级神经下间隙发育较差和AChE活性阴性的局灶区域导致了P终板染色较淡。
